Abstract: During durability testing of a new heavy-duty truck cab at the Xiangyang test facility, a cracking fault emerged. This article initially involves the collection of load spectra from the test facility, followed by the establishment of a high-precision dynamic model of the cab. Leveraging virtual iteration technology, the fatigue load boundary of the cab is obtained. Fatigue analysis conducted through finite element software reveals that the simulated failure location aligns with the actual cracking location of the cab. Based on this finding, optimizations and improvements are made to the failure-prone areas of the cab. After passing the simulation tests, the cab undergoes bench durability testing. The test results demonstrate that the optimized design of the cab fulfills the durability performance criteria of 1.50×106 km.

Key words: virtual iteration; load; cab; fatigue analysis

摘要： 某新款重型卡车驾驶室在襄阳试验场进行耐久性能验证时出现开裂故障。文章首先对 试验场载荷谱进行采集，其次建立高精度的驾驶室动力学模型，基于虚拟迭代技术，得到驾 驶室的疲劳载荷边界，通过有限元软件进行疲劳分析发现仿真失效位置与驾驶室实际开裂位 置一致，基于此对驾驶室失效位置进行优化改进，在仿真合格的前提下对驾驶室进行台架耐 久试验，试验结果表明驾驶室优化方案满足 1.50×106 km 耐久性能指标。

关键词: 虚拟迭代；载荷；驾驶室；疲劳分析